text: var express = require('express');
  var site = require('./controllers/site.js');
  var topic = require('./controllers/topic.js');
  var router = express.Router();
  
  router.post('/signup', site.signup);	// 用户注册
  router.post('/signin', site.signin);	// 用户登录
  
  router.post('/topic/create', topic.create);	// 发表话题
  
  module.exports = router;
  